These are obtained in Scenario Mode But Predominantly in Battle Mode for winning Battles in the Cups and Mountain. Each Coupon you get is worth a certain amount of points depending on how well you battled...with these points come Items. Here is a List of the Items and their PokéCoupon Price

Item:	Description:	Price:
TM13	Contains the Attack Ice Beam	4,000 pts
TM24	Contains the Attack Thunderbolt	4,000 pts
TM29	Contains the Attack Psychic	3,500 pts
TM32	Contains the Attack Double Team	4,000 pts
TM34	Contains the Attack Flamethrower	4,000 pts
Ganlon Berry	An Unobtainable Berry, Click for Details	15,000 pts
Salac Berry	An Unobtainable Berry, Click for Details	15,000 pts
Petaya Berry	An Unobtainable Berry, Click for Details	15,000 pts
Apicot Berry	An Unobtainable Berry, Click for Details	15,000 pts
Brightpower	Lowers Opponent's Accuracy	10,000 pts
Focus Band	Occassionaly Prevents a Pokémon From Fainting	10,000 pts
King's Rock	Can Evolve Slowpoke/Poliwhirl When Traded. Can cause Opponent to Flinch	10,000 pts
Leftovers	Restores HP Gradually During Battle	10,000 pts
Mental Herb	Prevents You Pokémon from being Attracted	8,000 pts
Quick Claw	Increases Chance of Attacking First	10,000 pts
White Herb	Cures Any Status Condition	8,000 pts